CN205384910U - Three pillar insulators are used to gas -insulated generating line - Google Patents

Abstract

The utility model discloses a three-column insulator for a gas-insulated busbar. The three-column insulator for a gas-insulated busbar includes a base body for inserting and connecting with a conductive rod. Insulating pillars, wherein the top of at least one insulating pillar is provided with a rolling fit device for rolling fit with the inner wall of the pipeline. The rolling fit device includes a device body, a rolling body arranged on the device body, and the rolling body is limited to prevent its The detached limit structure. Compared with the insulator in the prior art, a limiting structure for the rolling elements is added, which can prevent the rolling elements from falling easily during the installation process of the insulator into the pipeline, and the assembly is easier.

Description

Three-column insulators for gas insulated busbars

technical field

The utility model relates to the technical field of gas-insulated metal-enclosed transmission lines, in particular to a three-pillar insulator for a gas-insulated bus.

Background technique

The main differences between GIL and GIS busbars are: the standard section length of GIL busbar is longer (up to 10m~12m), and the cost is low (using GIL can save about 30~40% of the cost); installation conditions, etc. Traditional GIS busbar insulators cannot meet the needs of GIL. Chinese patent CN201975178U (authorized announcement date is 2011.09.14) discloses a three-pillar insulator structure for pipeline busbars. The ball, the first metal cup, the spring connected to the ground potential, the conductive ball, the second metal cup and the bracket, the insulator, the large insert, and the small insert are poured together to form a post insulator, and the three post insulators are evenly arranged at an angle of 120 degrees . The post insulators are fastened through the studs of the small inserts and the screw holes of the conductors. Both the first metal cup and the second metal cup are processed by machining, and the first metal cup and the second metal cup are connected to corresponding post insulators through large inserts. Place the two rolling balls in the openings of the two first metal cups, and place the bracket, spring, and conductive ball in the second metal cup at the same time, and finally, push the assembled parts into the pipe while maintaining the assembly relationship, and the completion assembly. Through analysis, the insulator structure has the following disadvantages: a special-shaped conductor connects three split insulators to form a sliding three-column insulator. This structure has high processing costs and is difficult to assemble. In addition, by putting the conductive ball into the corresponding metal cup, there is no way to ensure the cooperation between the conductive ball and the metal cup, and the "spring + conductive ball" structure also has the problem of difficult assembly. Putting the rolling ball into the metal cup also has the problem of the rolling ball falling off during assembly.

Chinese patent CN2884445Y (authorized announcement date is March 28, 2007) discloses a three-column insulator for high-voltage gas-insulated busbars. The insulator includes a tubular base, and the through hole in the center of the base is used for nesting with cylindrical busbars. In cooperation, at least three insulating pillars are uniformly arranged on the outer periphery of the base body, and each insulating pillar is integrated with the base body. One of the insulating struts has carbon brushes mounted on top, and the rest of the insulating struts have balls mounted on top. By using the insulator, the cylindrical bus bar can be stably supported in the closed pipe, and the balls and carbon brushes at the end of the insulating support ensure that the bus bar on which the insulator is installed can be smoothly inserted into the pipe. Although the base body of the insulator is integrally formed with the insulating support, it is convenient for the assembly of the busbar. However, this insulator also has some disadvantages: the mechanical reliability of the "ball + spring" structure is not high. Due to the influence of the gravity of the conductive rod and the insulator itself, the ball may not move, and the synchronous movement of the insulator and the conductive rod cannot be guaranteed. There is also the problem that the balls fall during assembly, which is inconvenient for assembly.

Contents of the invention

The purpose of the utility model is to provide a three-column insulator for a gas-insulated busbar to solve the problem that the rolling balls of the existing three-column insulator are easy to fall when the conductive rod is assembled into the pipeline.

In order to achieve the above objectives, the technical scheme of the three-column insulator for gas-insulated busbars of the present invention is as follows: The three-column insulators for gas-insulated busbars include a matrix for plug-in connection with conductive rods, and at least Three insulating pillars extending radially, at least one of which is provided with a rolling fit device on the top of the insulating pillar for rolling fit with the inner wall of the pipeline. The rolling fit device includes a device body, a rolling body arranged on the device body and The rolling element is limited and the limit structure is used to prevent it from falling off.

There are three insulating pillars, which are the first insulating pillar, the second insulating pillar and the third insulating pillar. The tops of the first insulating pillar and the second insulating pillar are provided with a rolling fit device, and the top of the third insulating pillar is provided with a conductive Matching device.

The base body is tubular, and the first insulating support, the second insulating support, and the third insulating support are cast integrally with the base body.

A support cylinder insert is coaxially provided in the base, and a connection structure for welding connection with the conductive rod is provided on the support cylinder insert.

The first insulating support and the second insulating support are provided with first inserts, and the rolling fit device is detachably connected to the corresponding first inserts.

The rolling fit is a bullseye wheel.

A second insert is provided on the top of the third insulating support, and the conductive matching device is connected to the second insert.

The conductive matching device includes a connecting piece for connecting with the second insert, and a contact support is installed on the connecting piece along the radial direction of the base body, and a conductive contact is arranged inside the contact support. A supporting spring is provided between the connecting part and the supporting part, and the conductive contact structure can be in contact with the inner wall of the pipeline under the action of the supporting spring.

The contact support includes a guide fitting part and a support contact part, the support contact part has a spherical structure for matching with the inner wall of the pipeline, and the middle part of the guide fit part is provided with a placement cavity for placing the support spring, Mounting holes are provided on both sides of the placement cavity on the contact supporting member, the conductive contact structure is installed in the mounting hole, and a contact spring is provided between the conductive contact structure and the connecting member.

The three-column insulator for gas-insulated busbars also includes a cylindrical particle trap connected to the insulating post.

Beneficial effects of the utility model: the rolling fit structure of the three-column insulator for the gas insulated busbar of the utility model, compared with the insulator in the prior art, adds a limit structure for the rolling body, which can prevent the rolling body from moving from the insulator to the pipeline. During the installation process, the rolling body is easy to fall, the assembly is easy, and the installation efficiency is improved.

Description of drawings

Fig. 1 is a structural schematic diagram of a three-column insulator for a gas-insulated busbar of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is a structural schematic diagram of the rolling fit device in Fig. 2;

Fig. 4 is a schematic structural view of the conductive coordination device in Fig. 2;

Fig. 5 is another structural schematic view (partial view) of the three-column insulator for the gas-insulated busbar of the present invention.

detailed description

Embodiment of the utility model three-column insulator for gas-insulated busbar: as shown in Fig. Three insulating pillars extending radially are arranged at intervals on the wall, which are the first insulating pillar 10 , the second insulating pillar 14 and the third insulating pillar 8 . The first insulating pillar 10 , the second insulating pillar 14 , the third insulating pillar 8 and the base body are integrally casted by insulating casting technology, and the first insulating pillar 10 , the second insulating pillar 14 and the third insulating pillar 8 are made of epoxy resin material. The tops of the first insulating pillar 10 and the second insulating pillar 14 are provided with a rolling fitting device 9 for rolling fitting with the inner wall of the pipeline 1 , and the top of the third insulating pillar 8 is provided with a conductive fitting device 5 . The rolling fit device includes a device body, a rolling body arranged on the device body, and a limiting structure for limiting the rolling body and preventing it from falling off.

In order to facilitate the installation and fixation of the conductive rod and the base body, a support tube insert 2 is coaxially provided in the base body, and the support tube insert 2 and the base body are also cast into one body. The support tube insert 2 is provided with a connection structure 3 for welding connection with the conductive rod, and after being inserted, it is fixed by welding. Adopting this fixing method solves the problem that the diameter tolerance of the aluminum tube, the raw material of the conductive rod, is large, and the matching gap that occurs when the support cylinder insert and the conductive rod are assembled is suddenly large or small. The insulator is welded on the conductive rod to realize the synchronous movement of the insulator and the conductive rod.

The first insulating support 10 and the second insulating support 14 are provided with first inserts 11 , and the rolling fit device is screwed to the corresponding first inserts 11 . In this embodiment, the rolling fit device 9 is a bull's-eye wheel. The bullseye wheel is a standard part, which reduces the assembly process and ensures the reliability of sliding. The rolling balls are used as rolling elements, and the outer shell of the rolling elements is used as a limiting structure. In other embodiments, other balls may also be used for the rolling body, and a corresponding limiting plate is provided for limiting the position, and the limiting plate is arranged on the insulating support. Furthermore, a telescopic spring can also be provided, and under the pushing action of the telescopic spring, the rolling body can better roll and cooperate with the inner wall of the pipeline.

The top of the third insulating pillar 8 is provided with a second insert 7 , and the conductive matching device is connected to the second insert 7 . The conductive matching device includes a connecting piece 52 for connecting with the second insert 7. The connecting piece 52 is guided along the radial direction of the substrate with a contact support 51, and a conductive contact structure is arranged inside the contact support 51. A supporting spring 55 is provided between the connecting piece 52 and the contact supporting piece 51 , and the conductive contact structure 54 can contact the inner wall of the pipe 1 under the action of the supporting spring. The contact support 51 includes a guide fitting part and a support contact part. The support contact part has a spherical structure 58 for matching with the inner wall of the pipeline. The middle part of the guide fit part is provided with a placement cavity 57 for placing a support spring. Mounting holes 56 are provided on both sides of the placement cavity, and the conductive contact structure 54 is installed in the mounting holes 56 , and a contact spring 53 is provided between the conductive contact structure and the connector 52 . The conductive contact structure 54 is a copper contact, and the contact spring 53 is a small spring. Two sets of small springs and copper contacts are used to ensure the reliability of the connection. In other embodiments, the conductive contact structure can also be made of other conductive materials, such as aluminum and copper alloys. Support spring 55 is a big spring, adopts big spring to adjust the overall height of the sliding insulator, reduces the size requirement of the sliding insulator and the shell (pipe), and adapts to the case that the shell is not round.

The three-column insulator for the gas-insulated busbar also includes a cylindrical particle trap 6 connected to the insulating post. The outer peripheral wall of the particle catcher is provided with three corresponding installation holes, and the particle catcher 6 is respectively pressed by a rolling fit device and a conductive fit device, which are threadedly connected to corresponding inserts. In fact, the conductive cooperating means is a retractable copper electrode, by means of which the particle trap is at the same potential as the casing of the pipe 1 . The particle catcher 6 is provided with a circular hole 61 in the bottom area. According to the Faraday cage principle, it can collect foreign matter such as metal shavings generated by friction, and enhance the insulation performance of the product.

The above-mentioned insulator is a sliding insulator, and the sliding insulator can absorb the difference in length between the shell and the conductive rod due to thermal expansion and contraction. Since the rolling fitting device is detachably connected with the first insulating support 10 and the second insulating supporting post 14, the rolling fitting device can be replaced to make the insulator a fixed insulator. For example, as shown in Figure 5, the rolling fit device is replaced by a fixed structure, the fixed structure includes a fastener 13, the fastener is threaded on the insulating support for connecting and compressing the particle catcher 6, and the fastener 13 is provided with A plastic spacer 12 is arranged to prevent the insulator and the shell from colliding with each other due to vibration and other reasons on the basis of ensuring that the insulator can be packed into the pipe shell.

In other embodiments, it is also possible to provide a conductive matching device on two of the insulating pillars. Wherein the conductive coordination device can also adopt a mounting part similar to that in the prior art for accommodating the conductive ball, the mounting part is connected to the insert on the corresponding insulating pillar, and a return spring is arranged in the mounting part to connect with the conductive ball Cooperate. In other embodiments, the number of insulating pillars can also be set to four, which are evenly spaced along the radial direction of the base body.

Claims (10)

1. Three-column insulators for gas-insulated busbars, including a matrix for plug-in connection with conductive rods, at least three radially extending insulating columns are arranged on the outer peripheral wall of the matrix, and the top of at least one insulating column is provided for The rolling fitting device rolling with the inner wall of the pipeline is characterized in that the rolling fitting device includes a device body, a rolling body arranged on the device body, and a limiting structure for limiting the rolling body and preventing it from falling off. 2. The three-column insulator for gas-insulated busbars according to claim 1, characterized in that: there are three insulating posts, which are the first insulating post, the second insulating post, and the third insulating post, the first insulating post, A rolling fitting device is provided on the top of the second insulating post, and a conductive fitting device is provided on the top of the third insulating post. 3. The three-column insulator for gas-insulated busbars according to claim 2, characterized in that: the base body is tubular, and the first insulating post, the second insulating post, and the third insulating post are integrally cast with the base body forming. 4. The three-column insulator for gas-insulated busbars according to claim 3, characterized in that: a support cylinder insert is coaxially provided in the base, and a support cylinder insert is provided on the support cylinder insert for welding connection with the conductive rod. connection structure. 5. The three-post insulator for gas-insulated busbars according to claim 2, characterized in that: the first insulating post and the second insulating post are provided with a first insert, and the rolling fit device is detachably connected to the on the corresponding first insert. 6. The three-column insulator for gas-insulated busbars according to claim 5, characterized in that: the rolling fit device is a bull's-eye wheel. 7. The three-column insulator for gas-insulated busbars according to claim 2, wherein a second insert is provided on the top of the third insulating post, and the conductive matching device is connected to the second insert. 8. The three-column insulator for gas-insulated busbars according to claim 7, characterized in that: the conductive matching device includes a connecting piece for connecting with the second insert, and the connecting piece is along the upper edge of the base body. The radial direction guide is equipped with a contact support, the contact support is provided with a conductive contact structure, a support spring is provided between the connecting piece and the support, and the conductive contact structure plays the role of the support spring The bottom can be in contact with the inner wall of the pipe. 9. The three-column insulator for gas-insulated busbars according to claim 8, characterized in that: the contact support includes a guide fitting part and a supporting contact part, and the supporting contact part has a hole for matching with the inner wall of the pipe. Spherical structure, the middle part of the guide fitting part is provided with a placement cavity for placing the support spring, the contact support is provided with installation holes on both sides of the placement cavity, and the conductive electric shock structure is installed on the installation In the hole, a contact spring is provided between the conductive contact structure and the connecting piece. 10. The three-column insulator for gas-insulated busbars according to any one of claims 1 to 9, characterized in that: the three-column insulator for gas-insulated busbars further includes a cylindrical particle catcher, and the particles The catcher is attached to an insulating post.